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More than 3.5 million homes in coastal counties — a designation defined by the National Oceanic and Atmospheric Administration (NOAA) — in North Carolina, South Carolina and Virginia that total more than $1 trillion in value are at risk of damage from the storm, according to a study by real estate website Zillow.

“The damage from Hurricane Florence is likely to be widespread as it bears down on the Atlantic coast,” Zillow senior economist Aaron Terrazas said in the release. “In the coastal counties of North Carolina, South Carolina and Virginia — the states most directly in Florence’s path – as many as 3.6 million homes are at risk, worth just over $1 trillion altogether. Beyond the homes that may be lost, damage to the infrastructure – roads, utilities and emergency services, for example – will add to the burden for these coastal communities.”

Coastal counties, of which there are 672 in the United States and 285 on the Atlantic, are counties that meet two criteria, according to NOAA:

“1. At least 15 percent of a county’s total land area is located within the nation’s coastalwatershed;

2. A portion of or an entire county accounts for at least 15 percent of a coastal cataloging unit (a drainage basin that falls within an estuarine or coastal drainage area).”